Alert archive / Missouri / Severe Thunderstorm Warnings in 2021

Severe Thunderstorm Warning 10, NWS Kansas City, MO

April 7, 2021Cooper County, Pettis County, Missouri

NWS Kansas City, MO issued this severe thunderstorm warning at Apr 7, 2021, 3:09 PM CDT for Cooper County, Pettis County, Missouri. It was in force for 23 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued: Apr 7, 2021, 3:09 PM CDT (20:09 UTC)
Expired: Apr 7, 2021, 3:32 PM CDT
In force: 23 min
Issued by: NWS Kansas City, MO
Area: Storm-based polygon
Tornado: Possible
Hail: 0.75 in
Wind: 60.0 mph

Counties Cooper County, MO, Pettis County, MO

The radar

The Pleasant Hill radar (KEAX), 112 km from the middle of the area, began a volume at 20:08 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

Issued	Product	Office	Lasted
Apr 7, 12:02 PM CDT	Severe Thunderstorm Watch	SPC	7 hr

The nearest sounding before it

Springfield, MO (KSGF), launched 12:00Z, 8.2 hours before the alert went out and 224 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-p

Temperature in red, dew point in green, the mixed-layer parcel dashed.

Hodograph

The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.

Mixed-layer CAPE: 790 J/kg
Mixed-layer CIN: -275 J/kg
Mixed-layer LCL: 767 m above ground
0-6 km bulk shear: 45 kt
0-1 km storm-relative helicity: 186 m²/s²
0-3 km storm-relative helicity: 223 m²/s²
Significant tornado parameter: 0.0
Supercell composite: 0.5

Open this sounding in Storm Lab

The text

As transmitted.

711 
WUUS53 KEAX 072009
SVREAX
MOC053-159-072045-
/O.NEW.KEAX.SV.W.0010.210407T2009Z-210407T2045Z/

BULLETIN - IMMEDIATE BROADCAST REQUESTED
Severe Thunderstorm Warning
National Weather Service Kansas City/Pleasant Hill MO
309 PM CDT Wed Apr 7 2021

The National Weather Service in Pleasant Hill has issued a

* Severe Thunderstorm Warning for...
  Northeastern Pettis County in central Missouri...
  Cooper County in central Missouri...

* Until 345 PM CDT.

* At 308 PM CDT, severe thunderstorms were located along a line
  extending from near Smithton to 8 miles southeast of Otterville,
  moving north at 45 mph.

  HAZARD...60 mph wind gusts.

  SOURCE...Radar indicated.

  IMPACT...Expect damage to roofs, siding, and trees.

* Locations impacted include...
  Pilot Grove, Smithton, Otterville, Bunceton, Nelson, Blackwater,
  Lamine and Clifton City.

This includes Interstate 70 in Missouri between mile markers 86 and
99.
 
PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3868 9281 3869 9298 3870 9306 3868 9306
      3868 9314 3893 9309 3893 9305 3897 9305
      3901 9301 3887 9262
TIME...MOT...LOC 2008Z 199DEG 40KT 3865 9313 3859 9294 

TORNADO...POSSIBLE
HAIL...<.75IN
WIND...60MPH
 
$$

CDB

2 follow-up statements

606 
WWUS53 KEAX 072026
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
326 PM CDT Wed Apr 7 2021

MOC159-072035-
/O.CAN.KEAX.SV.W.0010.000000T0000Z-210407T2045Z/
Pettis MO-
326 PM CDT Wed Apr 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR NORTHEASTERN PETTIS COUNTY IS
CANCELLED...

The storms which prompted the warning have moved out of the warned 
area. Therefore, the warning has been cancelled.

A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
central Missouri.

LAT...LON 3869 9295 3879 9297 3885 9305 3897 9305
      3901 9301 3887 9262 3868 9281
TIME...MOT...LOC 2025Z 199DEG 56KT 3891 9301 3885 9282 

$$

MOC053-072045-
/O.CON.KEAX.SV.W.0010.000000T0000Z-210407T2045Z/
Cooper MO-
326 PM CDT Wed Apr 7 2021

...A SEVERE THUNDERSTORM WARNING REMAINS IN EFFECT UNTIL 345 PM CDT
FOR COOPER COUNTY...

At 325 PM CDT, severe thunderstorms were located along a line 
extending from near Pilot Grove to near Bunceton, moving north at 60 
mph.

HAZARD...60 mph wind gusts.

SOURCE...Radar indicated.

IMPACT...Expect damage to roofs, siding, and trees.

Locations impacted include...
Pilot Grove, Bunceton, Nelson, Blackwater and Lamine. 

PRECAUTIONARY/PREPAREDNESS ACTIONS...

For your protection move to an interior room on the lowest floor of a
building.

&&

LAT...LON 3869 9295 3879 9297 3885 9305 3897 9305
      3901 9301 3887 9262 3868 9281
TIME...MOT...LOC 2025Z 199DEG 56KT 3891 9301 3885 9282 

HAIL...<.75IN
WIND...60MPH
 
$$

CDB

673 
WWUS53 KEAX 072032
SVSEAX

Severe Weather Statement
National Weather Service Kansas City/Pleasant Hill MO
332 PM CDT Wed Apr 7 2021

MOC053-072041-
/O.CAN.KEAX.SV.W.0010.000000T0000Z-210407T2045Z/
Cooper MO-
332 PM CDT Wed Apr 7 2021

...THE SEVERE THUNDERSTORM WARNING FOR COOPER COUNTY IS CANCELLED...
            
The storms which prompted the warning have weakened below severe
limits, and no longer pose an immediate threat to life or property.
Therefore, the warning has been cancelled.  However gusty winds are
still possible with these thunderstorms.

A Severe Thunderstorm Watch remains in effect until 700 PM CDT for
central Missouri.

LAT...LON 3869 9295 3879 9297 3885 9305 3897 9305
      3901 9301 3887 9262 3868 9281
TIME...MOT...LOC 2030Z 199DEG 40KT 3897 9298 3891 9279 

$$

CDB

The office that day

Everything else NWS Kansas City, MO issued on the same UTC day.

Issued	Product	Office	Counties	Lasted
Apr 7, 6:33 AM CDT	Special Weather Statement	EAX	Cooper	27 min
Apr 7, 11:24 AM CDT	Special Weather Statement	EAX	Harrison	36 min
Apr 7, 11:39 AM CDT	Special Weather Statement	EAX	Grundy	36 min
Apr 7, 12:31 PM CDT	Special Weather Statement	EAX	DeKalb	29 min
Apr 7, 1:16 PM CDT	Special Weather Statement	EAX	Henry	29 min
Apr 7, 1:21 PM CDT	Special Weather Statement	EAX	Worth	24 min
Apr 7, 1:40 PM CDT	Special Weather Statement	EAX	Henry	35 min
Apr 7, 2:49 PM CDT	Severe Thunderstorm Warning	EAX	Pettis	26 min
Apr 7, 3:34 PM CDT	Special Weather Statement	EAX	Howard	26 min
Apr 7, 4:39 PM CDT	Special Weather Statement	EAX	Adair, Macon	51 min

Nearby

Severe Thunderstorm Warnings in Missouri, 2021 Every severe thunderstorm warning in 2021

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.